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For the development of improved fuselage suction surface concepts for HLFC applications, wind tunnel experiments with multiple suction panels were carried out at DLR by using an aerodynamic flat plate model as a modular test rig, designed for different suction concepts. Studies with multiple porous parts were carried out in 2024 after four previous campaigns. Panels with a variety of different layouts can be installed, e.g.panels with suction walls, heated surfaces or instrumented with a traversable hot-wire. For investigations of fuselage laminarization, staggered suction panels are manufactured, allowing increased transition Reynolds numbers. In the following, results of critical N-factors from linear stability calculations will be compared for multiple suction panels. Various configurations of these panel arrangements were tested with respect to critical N-factor behavior.

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Critical N-Factor Behavior in HLFC Applications

  • 会议论文

  • 发表日期：

    2026年

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  • Heinrich Lüdeke,
  • Paul Weigmann,
  • Richard von Soldenhoff,
  • Konstantin Thamm

摘要

For the development of improved fuselage suction surface concepts for HLFC applications, wind tunnel experiments with multiple suction panels were carried out at DLR by using an aerodynamic flat plate model as a modular test rig, designed for different suction concepts. Studies with multiple porous parts were carried out in 2024 after four previous campaigns. Panels with a variety of different layouts can be installed, e.g.panels with suction walls, heated surfaces or instrumented with a traversable hot-wire. For investigations of fuselage laminarization, staggered suction panels are manufactured, allowing increased transition Reynolds numbers. In the following, results of critical N-factors from linear stability calculations will be compared for multiple suction panels. Various configurations of these panel arrangements were tested with respect to critical N-factor behavior.